<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #t1{
      color: green;
    }
    .t2{
      color: deepskyblue;
    }

    h1,h2{
      background-color: yellow;
    }

    input[type="submit"]{
      background-color: red;
    }
    input[type="button"]{
      color: pink;
    }

    *{
      border: 1px solid green;
    }
  </style>

</head>
<body>
<ul>
  <li id="t1">张学友</li>
  <li class="t2">刘德华</li>
  <li>郭富城</li>
</ul>

<h1 class="t2">悟空</h1>
<h1>八戒</h1>
<h1>唐僧</h1>
<h2>刘备</h2>
<input type="submit">
<input type="button" value="按钮">





</body>
</html>